Re: "Foreign" marked B9A valves
Some valve types within the Philips group were probably only ever made at one factory, then labelled Mullard, Valvo, Philips etc. according to where they were going to be sold. It sometimes seems to be forgotten in the UK that Mullard was simply a Philips brand name except for the earliest days of the valve era.
BVA didn't mind valves being imported, provided that they were being sold by BVA members at the agreed BVA prices.
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